EP3355862B1 - Silica-based antimicrobial oral compositions - Google Patents

Silica-based antimicrobial oral compositions Download PDF

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Publication number
EP3355862B1
EP3355862B1 EP16777880.2A EP16777880A EP3355862B1 EP 3355862 B1 EP3355862 B1 EP 3355862B1 EP 16777880 A EP16777880 A EP 16777880A EP 3355862 B1 EP3355862 B1 EP 3355862B1
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Prior art keywords
silica
range
composition
antimicrobial compound
cationic antimicrobial
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EP16777880.2A
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German (de)
English (en)
French (fr)
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EP3355862A1 (en
Inventor
Terry Nassivera
Karl Gallis
Eric LUNDQUIST
Linda Mauller
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Evonik Operations GmbH
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Evonik Operations GmbH
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/0053—Mouth and digestive tract, i.e. intraoral and peroral administration
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/0216—Solid or semisolid forms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/04—Dispersions; Emulsions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/25—Silicon; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/26—Aluminium; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/41—Amines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
    • A61K8/4906—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with one nitrogen as the only hetero atom
    • A61K8/4926—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with one nitrogen as the only hetero atom having six membered rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/0053—Mouth and digestive tract, i.e. intraoral and peroral administration
    • A61K9/0056—Mouth soluble or dispersible forms; Suckable, eatable, chewable coherent forms; Forms rapidly disintegrating in the mouth; Lozenges; Lollipops; Bite capsules; Baked products; Baits or other oral forms for animals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
    • A61K9/143—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with inorganic compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/02—Stomatological preparations, e.g. drugs for caries, aphtae, periodontitis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q11/00—Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/20—Chemical, physico-chemical or functional or structural properties of the composition as a whole
    • A61K2800/28—Rubbing or scrubbing compositions; Peeling or abrasive compositions; Containing exfoliants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/41—Particular ingredients further characterized by their size
    • A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns

Definitions

  • the present invention is directed to oral compositions containing cationic antimicrobial compounds and silica and/or silicate materials.
  • antimicrobial quaternary ammonium salts are acceptable for use in the oral environment, for example cetylpyridinium chloride (CPC), benzalkonium chloride (BAC), domiphen chloride, and chlorohexidine.
  • CPC cetylpyridinium chloride
  • BAC benzalkonium chloride
  • domiphen chloride and chlorohexidine.
  • MIC minimum inhibitory concentration
  • silica and/or silicate materials have been known to be highly incompatible, resulting in ineffective salivary levels to provide a sufficient antimicrobial benefit. This is due primarily to the well-established interactions between surface silanol groups and quaternary amine moieties.
  • WO 99/33352 A1 discloses a method for producing a chewing gum with a controlled release of an antimicrobial agent.
  • the chewing gum product is produced by a) mixing a quantity of an antimicrobial agent with a modifying agent and b) adding a quantity of the mixture to a chewing gum formulation to provide an antimicrobial agent level in the chewing gum formulation of from about 0.01 % to about 5.0 %.
  • such oral compositions can comprise (i) a carrier, (ii) from about 0.02 to about 2 wt. % of a cationic antimicrobial compound, and (iii) from about 0.1 to about 4.5 wt. % of a silica and/or silicate material.
  • the silica and/or silicate material can be characterized by an average particle size in a range from about 0.1 to about 20 ⁇ m, and by a CTAB surface area in a range from about 145 to about 550 m 2 /g.
  • the silica and/or silicate material can have an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material.
  • an oral composition can comprise (a) a carrier and (b) from about 0.15 to about 7 wt. % of treated particles comprising (I) a silica and/or silicate material and (II) a cationic antimicrobial compound.
  • the silica and/or silicate material can have an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material
  • the treated particles can comprise the cationic antimicrobial compound at an amount in a range from about 50% to about 200% of the absorptive capacity.
  • the absorptive capacity of the silica and/or silicate material is determined using a pH titration test, as described herein.
  • a representative process can comprise (A) contacting an aqueous slurry of the silica and/or silicate material with the cationic antimicrobial compound to form treated particles, and (B) contacting the treated particles with the carrier to form the oral composition.
  • the oral compositions encompassed herein can be used to reduce or inhibit microbial growth.
  • a method for reducing or inhibiting microbial growth in an oral cavity of a subject consistent with the present invention can comprise administering (or delivering) an effective amount of any of the oral compositions disclosed herein to the oral cavity of the subject.
  • compositions and methods are described herein in terms of “comprising” various components or steps, the compositions and methods can also “consist essentially of' or “consist of' the various components or steps, unless stated otherwise.
  • oral compositions consistent with aspects of the present invention can comprise; alternatively, can consist essentially of; or alternatively, can consist of; (i) a carrier, (ii) a cationic antimicrobial compound, and (iii) a silica and/or silicate material.
  • groups of elements are indicated using the numbering scheme indicated in the version of the periodic table of elements published in Chemical and Engineering News, 63(5), 27, 1985 .
  • a group of elements can be indicated using a common name assigned to the group; for example, alkali metals for Group 1 elements, alkaline earth metals for Group 2 elements, and so forth.
  • contacting is used herein to refer to materials or components which can be blended, mixed, slurried, dissolved, reacted, treated, or otherwise contacted or combined in some other manner or by any suitable method.
  • the materials or components can be contacted together in any order, in any manner, and for any length of time, unless otherwise specified.
  • the CTAB surface area of the silica and/or silicate material can be in certain ranges in various aspects of this invention.
  • the CTAB surface area can be in a range from about 200 to about 450 m 2 /g
  • the intent is to recite that the surface area can be any surface area within the range and, for example, can be equal to about 200, about 250, about 300, about 350, about 400, or about 450 m 2 /g.
  • the surface area can be within any range from about 200 to about 450 m 2 /g (for example, from about 250 to about 350 m 2 /g), and this also includes any combination of ranges between about 200 and about 450 m 2 /g (for example, the surface area can be in a range from about 200 to about 300 m 2 /g or from about 350 to about 450 m 2 /g). Likewise, all other ranges disclosed herein should be interpreted in a manner similar to this example.
  • oral compositions containing silica and/or silicate materials methods for producing the oral compositions, and methods of using the oral compositions to reduce microbial growth in an oral cavity of a subject.
  • oral compositions containing specific silica and/or silicate materials, and related methods of use such that the silica and/or silicate materials can absorb the antimicrobial agent, retain the agent while in a static oral composition (e.g., toothpaste, mouthwash, chewing gum, and the like), yet provide an effective controlled release (above the minimum inhibitory concentration, MIC) when introduced into a dynamic environment, such as the oral cavity of a subject where constant salivary flow conditions exist.
  • a static oral composition e.g., toothpaste, mouthwash, chewing gum, and the like
  • MIC minimum inhibitory concentration
  • an oral composition can comprise (i) a carrier, (ii) from about 0.02 to about 2 wt. % of a cationic antimicrobial compound, and (iii) from about 0.1 to about 4.5 wt. % of a silica and/or silicate material characterized by an average particle size in a range from about 0.1 to about 20 ⁇ m, and by a CTAB surface area in a range from about 145 to about 550 m 2 /g.
  • the silica and/or silicate material (characterized by an average particle size in a range from about 0.1 to about 20 ⁇ m, and by a CTAB surface area in a range from about 145 to about 550 m 2 /g) can comprise a silica material (one or more than one), while in another aspect, the silica and/or silicate material can comprise a silicate material (one or more than one). Yet, in another aspect, the silica and/or silicate material can comprise a mixture or combination of a silica material and a silicate material.
  • mixtures or combinations of two or more different silica materials, two or more different silicate materials, or a silica material and a silicate material can be employed in aspects of this invention.
  • an oral composition can comprise (a) a carrier and (b) from about 0.15 to about 7 wt. % of treated particles comprising (I) a silica and/or silicate material and (II) a cationic antimicrobial compound.
  • the silica and/or silicate material can have an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material, and the treated particles can comprise the cationic antimicrobial compound at an amount in a range from about 50% to about 200% of the absorptive capacity.
  • the silica and/or silicate material (characterized by an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material) can comprise a silica material (one or more than one), while in another aspect, the silica and/or silicate material can comprise a silicate material (one or more than one). Yet, in another aspect, the silica and/or silicate material can comprise a mixture or combination of a silica material and a silicate material.
  • mixtures or combinations of two or more different silica materials, two or more different silicate materials, or a silica material and a silicate material can be employed in aspects of this invention.
  • the amount of the treated particles present in the oral compositions generally can range from about 0.15 to about 10 wt. %, based on the total weight of the oral composition. In one aspect, the amount of the treated particles can be in a range from about 0.15 to about 7 wt. %, or from about 0.5 to about 7 wt. %. In another aspect, the amount of the treated particles can be in a range from 0.5 to about 4.5 wt. %, or from about 0.5 to about 4 wt. %. In yet another aspect, the amount of the treated particles can be in a range from about 0.75 to about 6 wt. %, or from about 1 to about 4 wt. %.
  • the amount of the treated particles can be in a range from about 0.25 to about 3 wt. %, or from about 1 to about 3.5 wt. %.
  • Other appropriate ranges for the weight of the treated particles, based on the total weight of the oral composition, are readily apparent from this disclosure.
  • a suitable silica and/or silicate material can be determined by its absorptive capacity for the cationic antimicrobial compound.
  • the silica and/or silicate material can have an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material.
  • the absorptive capacity in mg of the cationic antimicrobial compound per gram of silica and/or silicate material is the point at which a suspension of the silica and/or silicate material reaches its saturation point for the particular cationic antimicrobial compound.
  • the cationic antimicrobial compound is progressively added to a suspension of a silica and/or silicate material and the pH profile is monitored until the percentage change in pH is greater than - 0.25%, indicating a leveling off of the pH, or the pH moving in the positive direction. This indicates that any further antimicrobial agent addition no longer results in generation of exchanged protons from the silica/silicate surface.
  • a correction is applied to compensate for the moisture content of the silica and/or silicate material based on the loss on drying (LOD) of the material at 105 °C for 2 hr. For example, if 100 g of a 1 wt. % silica suspension is prepared with a silica having a LOD of 6 wt. %, 1.06 g of the as-received silica would be diluted to 100 g with deionized water. Similarly, a correction to the amount of silica and/or silicate material used in the suspension is adjusted to compensate for the amount of sodium sulfate present.
  • LOD loss on drying
  • the silica and/or silicate material can have an absorptive capacity of the cationic antimicrobial compound in a range from about 175 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material.
  • the absorptive capacity can be in a range from about 175 to about 350 mg/g, or from about 175 to about 300 mg/g.
  • the absorptive capacity can be in a range from about 200 to about 400 mg/g, or from about 200 to about 350 mg/g.
  • the absorptive capacity can be in a range from about 200 to about 325 mg/g, or from about 210 to about 325 mg/g. Other appropriate ranges for the absorptive capacity of the silica and/or silicate material are readily apparent from this disclosure.
  • the treated particles present in the oral compositions generally can contain a wide range in the amount of the cationic antimicrobial compound that is present.
  • the treated particles can comprise the cationic antimicrobial compound at an amount in a range from about 50% to about 200% of the absorptive capacity.
  • the treated particles can contain a silica and/silicate material that is fully loaded with the cationic antimicrobial compound (100% of the absorptive capacity), less than fully loaded with the cationic antimicrobial compound (e.g., 50-85% of the absorptive capacity), or overloaded with the cationic antimicrobial compound (e.g., 110-175% of the absorptive capacity).
  • the excess cationic antimicrobial compound (>100%) can be loosely bound to a surface of, or associated with, the silica and/or silicate during preparation and drying of the treated particles, but once these overloaded treated particles are contacted with the carrier, it is believed that the excess cationic antimicrobial compound, in many circumstances, will rapidly leave the silica and/silicate material.
  • the treated particles can comprise the cationic antimicrobial compound at an amount in a range from about 50% to about 200% of the absorptive capacity.
  • the treated particles comprise an amount of the cationic antimicrobial material in other ranges, based on the absorptive capacity, such as from about 50% to about 150%, from about 50% to about 125%, from about 50% to about 100%, from about 50% to about 95%, from about 60% to about 100%, from about 75% to about 150%, from about 75% to about 100%, or from about 75% to about 95%, and the like.
  • Other appropriate ranges for the amount of the cationic antimicrobial compound present with the treated particles, based on the absorptive capacity of the silica and/or silicate material are readily apparent from this disclosure.
  • the amount of the cationic antimicrobial compound in any of the oral compositions disclosed herein can fall within a range from about 0.02 to about 2 wt. %, based on the total weight of the oral composition.
  • the amount of the cationic antimicrobial compound can be in a range from about 0.05 to about 2 wt. %; alternatively, from about 0.02 to about 1 wt. %; alternatively, from about 0.05 to about 1 wt. %; alternatively, from about 0.1 to about 1 wt. %; alternatively, from about 0.2 to about 1 wt. %; or alternatively, from about 0.2 to about 0.6 wt. %.
  • Other appropriate ranges for the weight of the cationic antimicrobial compound, based on the total weight of the oral composition are readily apparent from this disclosure.
  • the amount of the silica and/or silicate material (total, if more than one) in the oral composition typically falls within a range from about 0.1 to about 4.5 wt. %, or from about 0.5 to about 8 wt. %, such as, for example, from about 0.5 to about 4.5 wt. %, from about 0.5 to about 3 wt. %, from about 1 to about 6 wt. %, from about 1 to about 3 wt. %, from about 0.5 to about 2.5 wt. %, from about 0.1 to about 2 wt. %, or from about 1 to about 2 wt. %.
  • this silica and/or silicate material is (#1) characterized by an average particle size in a range from about 0.1 to about 20 ⁇ m, and by a CTAB surface area in a range from about 145 to about 550 m 2 /g, and/or (#2) characterized by an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material.
  • the only silica and/or silicate material in the oral composition is that which is defined by at least one of (#1) the aforementioned particle size and CTAB surface area features and (#2) the aforementioned absorptive capacity of the cationic antimicrobial compound.
  • the only silica and/or silicate material in the oral composition is a silica and/or silicate material with these defined attributes.
  • the oral composition can contain additional silica and/or silicate materials, these additional materials being different from those silica and/or silicate materials with the above-defined attributes (particles size and CTAB surface area, absorptive capacity of the cationic antimicrobial compound).
  • the oral composition can further comprise a silica and/or silicate material that is different from the silica and/or silicate material characterized by an average particle size in a range from about 0.1 to about 20 ⁇ m and a CTAB surface area in a range from about 145 to about 550 m 2 /g, and/or different from the silica and/or silicate material characterized by an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material.
  • a silica and/or silicate material that is different from the silica and/or silicate material characterized by an average particle size in a range from about 0.1 to about 20 ⁇ m and a CTAB surface area in a range from about 145 to about 550 m 2 /g, and/or different from the silica and/or silicate material characterized by an absorptive capacity of the cationic antimicrobial
  • oral composition consistent with certain aspects of this invention can further contain from about 1 to about 35 wt. %, from about 5 to about 25 wt. %, or from about 5 to about 15 wt. %, of an abrasive silica material characterized by a CTAB surface area in a range from about 1 to about 60 m 2 /g, from about 1 to about 50 m 2 /g, from about 1 to about 35 m 2 /g, or from about 2 to about 50 m 2 /g.
  • the abrasive silica material can be characterized by a relatively low absorptive capacity of the cationic antimicrobial compound, often in a range from about 2 to about 100 mg, from about 3 to about 50 mg, or from about 5 to about 40 mg, of the cationic antimicrobial compound per gram of the abrasive silica material.
  • the abrasive silica material can have any suitable average particle size (d50), for instance, from about 0.1 to about 20, from about 0.5 to about 10, or from about 1.5 to about 7 ⁇ m.
  • One component of the oral composition is a cationic antimicrobial compound.
  • Any suitable cationic antimicrobial compound can be used, illustrative and non-limiting examples of which include cetylpyridinium chloride (CPC), benzalkonium chloride (BAC), domiphen bromide, chlorhexidine, and the like, as well as any mixture or combination thereof.
  • the cationic antimicrobial compound can comprise cetylpyridinium chloride (CPC); alternatively, benzalkonium chloride (BAC); alternatively, domiphen bromide; or alternatively, chlorhexidine.
  • the cationic antimicrobial compound can comprise any suitable antimicrobial quaternary ammonium compound, illustrative and non-limiting examples of which include cetylpyridinium chloride (CPC), benzalkonium chloride (BAC), and the like, as well as combinations thereof.
  • CPC cetylpyridinium chloride
  • BAC benzalkonium chloride
  • silica and/or silicate material Another component of the oral composition is the silica and/or silicate material.
  • the silica and/or silicate material contemplated herein can comprise any suitable silica and/or silicate material, non-limiting examples of which can include silica gels, fumed silicas, precipitated silicas, colloidal silicas, silicates, alkali metal aluminosilicates, alkaline earth metal-modified alkali metal aluminosilicates, and the like, as well mixtures or combinations thereof.
  • Representative silica gel materials include those produced by Grace (e.g., SYLOID, SYLODENT) and PQ Corporation (e.g., GASIL, SILCRON, SORBSIL), among others.
  • Representative fumed silica materials include those produced by Cabot Corporation (e.g., CABOSIL) and Evonik Industries (e.g., AEROSIL), among others.
  • Representative precipitated silica materials include those produced by J.M.
  • Huber Corporation e.g., ZEODENT, ZEOFREE, ZEOTHIX
  • Grace e.g., SYLODENT
  • PQ Corporation e.g., SORBOSIL
  • Solvay e.g., TIXOSIL, ZEOSIL
  • Evonik Industries e.g., SIDENT, SIPERNAT
  • Representative colloidal silica materials include those produced by W.R. Grace & Co. (e.g., LUDOX), among others.
  • alkali metal aluminosilicate and alkaline earth metal-modified alkali metal aluminosilicate materials include those produced by J.M Huber Corporation (e.g., ZEOLEX, HYDREX, HUBERSORB), among others.
  • the silica and/or silicate material can comprise any suitable silicate, non-limiting examples of which can include calcium silicate particles, magnesium silicate particles, and the like, as well as combinations thereof.
  • the silica and/or silicate material can comprise any suitable aluminosilicate, non-limiting examples of which can include alkali metal aluminosilicates (e.g., sodium aluminosilicates), alkaline earth metal-modified alkali metal aluminosilicates (e.g., sodium magnesium aluminosilicate), and the like, as well as combinations thereof.
  • any of the suitable silica and/or silicate materials can be amorphous, can be synthetic, or can be both amorphous and synthetic.
  • the silica and/or silicate material - for instance, characterized by an absorptive capacity of the cationic antimicrobial compound in a range from about 200 to about 400 mg of the cationic antimicrobial compound per gram of the silica and/or silicate material - also can have any of the characteristics or properties provided hereinbelow, and in any combination.
  • the silica and/or silicate material can have a relatively small average particle size.
  • the silica and/or silicate material can have an average particle size (d50) that often falls within a range from about 0.1 to about 20 ⁇ m, such as, for instance, from about 0.1 to about 10, from about 1 to about 20, from about 0.5 to about 20, from about 0.5 to about 10, from about 1 to about 10, from about 2 to about 10, from about 0.5 to about 6, from about 1.5 to about 7, from about 1.5 to about 6, or from about 2 to about 6 ⁇ m, and the like.
  • Other appropriate ranges for the average particle size are readily apparent from this disclosure.
  • the silica and/or silicate material can have a relatively high CTAB surface area.
  • the CTAB surface area can be in a range from about 130 to about 650 m 2 /g, or from about 225 to about 650 m 2 /g.
  • the CTAB surface area can be in a range from about 145 to about 550 m 2 /g, or from about 175 to about 550 m 2 /g.
  • the CTAB surface area can be in a range from about 250 to about 550 m 2 /g, from about 250 to about 450 m 2 /g, or from about 250 to about 350 m 2 /g.
  • the CTAB surface area can be in a range from about 200 to about 450 m 2 /g, or from about 200 m 2 /g to about 400 m 2 /g. Other appropriate ranges for the CTAB surface area are readily apparent from this disclosure.
  • the silica and/or silicate material can have a relatively high BET surface area.
  • the BET surface area of the silica and/or silicate material often falls within a range from about 130 to about 800 m 2 /g, from about 200 to about 800 m 2 /g, from about 300 to about 800 m 2 /g, or from about 300 to about 750 m 2 /g.
  • the BET surface area can be in a range from about 250 to about 700 m 2 /g, from about 300 to about 650 m 2 /g, from about 350 to about 700 m 2 /g, or from about 375 to about 675 m 2 /g, and the like. Other appropriate ranges for the BET surface area are readily apparent from this disclosure.
  • the silica and/or silicate materials (and oral compositions) described herein do not require a metal or metal adduct, containing for example, aluminum, zinc, tin, strontium, iron, silver, or copper, and the like. Additionally, in aspects of this invention, the silica and/or silicate materials (and oral compositions) described herein are not modified (covalently) with an organic functionality or with other surface functionalization.
  • the carrier can comprise any suitable orally acceptable solid or liquid carrier.
  • the carrier can comprise water
  • the carrier can comprise a dentifrice composition, and so forth.
  • the oral composition can contain any suitable additive or additives, non-limiting examples of which can include a humectant, a binder, a flavoring agent, an anti-cavity agent, a colorant, a sweetener, a surfactant, a thickener, or a preservative, and the like, as well as any combination thereof.
  • the form of the oral composition is not particularly limited, provided that the form is suitable for use in an oral cavity of a human or other mammal.
  • forms or end-use products for the oral composition can include, but are not limited to, a mouthwash, a mouth rinse, a mouth spray, a chewing gum, a breath strip, a lozenge, a candy, a tablet, a mint, a toothpaste, a gel, an edible film, or a whitening strip, and the like.
  • Other uses or applications for the oral compositions described herein are readily apparent from this disclosure.
  • the oral compositions described herein can be oral compositions configured for, designed for, made for, or used in, the sustained or controlled release of the cationic antimicrobial compound, for instance, in an oral cavity of a subject.
  • Such processes to prepare oral compositions consistent with this invention can comprise (A) contacting an aqueous slurry of the silica and/or silicate material with the cationic antimicrobial compound to form treated particles, and (B) contacting the treated particles with the carrier to form the oral composition.
  • the features of the processes are independently described herein and these features can be combined in any combination to further describe the disclosed processes.
  • the silica and/or silicate material can be characterized by any average particle size disclosed herein, any BET surface area disclosed herein, any CTAB surface area disclosed herein, and any absorptive capacity disclosed herein.
  • the processes disclosed herein can be conducted in any suitable apparatus, such as a container or vessel with a mixing device, or a stirred tank.
  • the cationic antimicrobial compound can be contacted with the silica and/or silicate material at a variety of temperature and time periods.
  • the temperature can be in a range from about 10 °C to about 80 °C; alternatively, from about 10 °C to about 70 °C; alternatively, from about 10 °C to about 60 °C; alternatively, from about 20 °C to about 80 °C; alternatively, from about 20 °C to about 60 °C; alternatively, from about 20 °C to about 50 °C; or alternatively, from about 25 °C to about 75 °C.
  • these temperature ranges also are meant to encompass circumstances where the process is conducted at a series of different temperatures (e.g., an initial temperature, a final temperature), instead of at a single fixed temperature, falling within the respective ranges.
  • the cationic antimicrobial compound and the silica and/or silicate material can be contacted initially at a lower temperature, and subsequently, the temperature can be increased to a higher, final temperature.
  • the duration of the step of contacting the cationic antimicrobial compound with at least one of a silica material and a silicate material is not limited to any particular period of time. Hence, this step can be conducted, for example, in a time period ranging from as little as 15-30 seconds to as long as 24-48 hours, or more.
  • the appropriate contacting time can depend upon, for example, the initial/final temperature, and the percent solids in the aqueous slurry, among other variables.
  • the contacting step can be conducted in a time period that can be in a range from about 15 sec to about 48 hr, such as, for example, from about 1 min to about 24 hr, from about 1 min to about 8 hr, from about 15 min to about 6 hr, from about 5 min to about 2 hr, or from about 30 min to about 2 hr.
  • time period can be in a range from about 15 sec to about 48 hr, such as, for example, from about 1 min to about 24 hr, from about 1 min to about 8 hr, from about 15 min to about 6 hr, from about 5 min to about 2 hr, or from about 30 min to about 2 hr.
  • Other conditions sufficient for conducting the processes described herein are readily apparent from this disclosure.
  • the treated particles can be dried using any suitable technique, a representative example of which is spray drying. Additionally or alternatively, the processes to produce the oral composition can further comprise a step of wet milling the treated particles, if desired. A bead milling process can be employed, although the wet milling step is not limited thereto. Additionally or alternatively, the processes to produce the oral compositions can further comprise a step of dry milling the treated particles, if desired. A hammer milling process can be employed, although the dry milling step is not limited thereto.
  • the treated particles can be contacted with the carrier to form the oral composition.
  • an aqueous slurry of the treated particles can be contacted with the carrier in step (B), or alternatively, treated particles that have been dried can be contacted with the carrier in step (B).
  • the treated particles can be contacted with the carrier at a variety of temperature and time periods, such as described herein for step (A).
  • a method of reducing or inhibiting microbial growth in an oral cavity of a subject in need thereof is provided.
  • This method can comprise administering (or delivering) a therapeutically effective amount of any of the oral compositions disclosed herein to the oral cavity of the subject.
  • the term "subject” refers generally to any species of mammal.
  • a mammal encompasses a primate, human, rodent, canine, feline, bovine, ovine, equine, swine, caprine, and the like, but is not limited thereto.
  • the "subject” is a human subject.
  • an oral composition refers to an amount of the composition to be administered to the subject in need thereof.
  • the effective amount can vary based on the particular dosage form of the composition (e.g., mouthwash versus toothpaste versus chewing gum), amount of the silica and/or silicate material in the composition, amount of the antimicrobial compound in the composition, and the like, among numerous other factors. While the suitable effective amount can vary as discussed, often the effective amount of the oral composition can range from about 0.25 to about 25 grams; alternatively, from about 0.25 to about 2 grams; alternatively, from about 0.5 to about 5 grams; alternatively, from about 10 to about 20 grams; or alternatively, from about 5 to about 15 grams. Other appropriate ranges for effective amount of the oral composition are readily apparent from this disclosure.
  • the effective amount can be an amount sufficient for a controlled release of at least 1 ppm of the cationic antimicrobial compound (ppm based on weight of contents in the oral cavity, such as saliva) for any suitable controlled release time period.
  • the controlled release time period often can be at least about 15 min, at least about 30 min, at least about 1 hr, or at least about 2 hr, and typical ranges of controlled release time periods can include, but are not limited to, from about 15 min to about 12 hr, from about 30 min to about 8 hr, from about 30 min to about 3 hr, from about 2 hr to about 15 hr, and the like.
  • the average particle size refers to the particle size for which 50% of the sample has a smaller size and 50% of the sample has a larger size. Average particle size was determined via the laser diffraction method using a Horiba LA 300 instrument.
  • the BET surface areas disclosed herein were determined in accordance with the BET nitrogen adsorption method of Brunaur et al., J. Am. Chem. Soc., 60, 309 (1938 ), which is well known to those of skill in the art.
  • CTAB surface areas disclosed herein were determined by absorption of CTAB (cetyltrimethylammonium bromide) on the silica/silicate surface, the excess separated by centrifugation and the quantity determined by titration with sodium lauryl sulfate using a surfactant electrode. Specifically, about 0.5 grams of the silica/silicate material were placed in a 250-mL beaker with 100 mL CTAB solution
  • a master 20 wt. % aqueous slurry of the desired silica was made using deionized water and one gram aliquots were distributed into clean pre-weighed fifteen milliliter tubes (200 mg silica). Seven subjects (varying in age and gender, six male and one female) each took a one gram aliquot of the slurry, agitated it to make sure it was fully suspended, poured it into their mouth, and brushed their teeth as usual for one minute, taking care not to ingest any of the contents. The empty tubes were then reweighed to determine the weight of actual slurry used by each participant for each silica sample. The subjects then expectorated the contents of their mouth into a dry and pre-weighed crucible.
  • the subjects were then given five milliliters of deionized water to rinse their mouth, and expectorated this rinse into the same crucible.
  • These crucibles and three controls which contained a one gram aliquot of the original slurry and five milliliters of rinse water, were placed in a muffle furnace and calcined at 700 °C overnight to remove any introduced organic matter. The furnace was then turned off and once cool, the crucibles were collected and placed in a 100 °C oven until they were ready to be reweighed. The average difference in weight for the three controls was determined and used to determine the quantity of silica per gram of slurry.
  • This value was then used along with the amounts of slurry utilized by each participant to determine a theoretical amount of silica utilized in their test. The difference in weight for the crucibles of the seven participants was then compared to this theoretical amount to calculate the quantity of silica retained as a percentage. These seven values were then used to determine the average amount of each silica sample that was retained in the mouth after brushing.
  • Example 1 This experimental protocol was performed for a standard oral care silica with an average particle size of about 8 ⁇ m (Example 1, Table I ), and a smaller particle size version of about 3.1 ⁇ m (Example 2, Table II ).
  • Example 2 a standard oral care silica with an average particle size of about 8 ⁇ m
  • Example 2 a smaller particle size version of about 3.1 ⁇ m
  • the 8 ⁇ m particle size silica of Example 1 had an average retention of about 6.27% (11 mg)
  • the smaller particle size silica of Example 2 had an increased percent retention of about 10.45% (17 mg). Therefore, it was concluded that 10-20 mg of silica could be retained in the oral cavity, and that potentially more than 20 mg of silica could be retained in the oral cavity if a smaller particle size material than Example 2 was utilized.
  • Table III summarizes the characteristics of the silica/silicate materials that were evaluated.
  • a variety of silica/silicate grades are shown in Table III, ranging from highly CPC compatible (Silica A), several commercially available silica grades commonly used in dentifrice applications (Silica B, Silica C, Silica D), and the experimental materials (Silica E1, Silica E2, Silica E3, Silica E4, Silicate E5) that would be generally regarded as highly incompatible with CPC and other cationic or quaternary ammonium antimicrobial agents.
  • the resultant pH profile from a titration with CPC was used to determine the absorptive capacity of each particular silica/silicate material shown in Table III, in units of mg of CPC per gram of silica/silicate.
  • the pH profiles were generated by titrating using a 4 wt. % CPC solution. All of the silica/silicate suspensions were adjusted to a pH of ⁇ 8.5 with either 0.5M NaOH or 0.5M HCl, to help with consistency of the initial surface chemistry and a more direct comparison. With regards to the lower capacity materials, a 5 wt. % suspension was employed to get better resolution of the end point, while a 1 wt.
  • the pH profiles for each of the silica materials for Examples 3-11 are illustrated in FIG. 1 , in which the pH is shown as a function of the CPC loading on a mg/g basis, as this takes into account the differences in the amount of silica/silicate employed for each test.
  • the absorptive capacity of each silica/silicate was defined by the pH curve separately, and Table V summarizes the absorptive capacity data.
  • the absorptive capacity (or saturation point) from the pH profile was defined as the point where the % change from the previous point became greater than -0.25% (leveled off, or moving in the positive direction).
  • Table V Also included in Table V is the quantity of each silica/silicate that would be necessary to hold the amount of CPC that would be in a 1 gram ribbon of toothpaste at a CPC loading of 0.3 wt. % (3 mg CPC total), based on the absorptive capacities established using the pH profile.
  • This data indicates that the silica/silicate materials of Examples 6-11 (Silica D, Silica E1, Silica E2, Silica E3, Silica E4, and Silicate E5) would be capable of retaining all of the available CPC in a 20 mg sample that could be retained in the oral cavity (see Examples 1-2).
  • a desired amount of silica (on a dry basis) was loaded into a vial, and 0.75 g of a 4 wt. % CPC solution was added. After adding the CPC solution, deionized water was added to bring the total weight of the suspension up to 10 g.
  • One series utilized a weight of silica to give 10 wt. % in the suspension (on a dry basis) to mimic a typical silica loading in toothpaste (Examples 12-17, using Silica A, Silica B, Silica C, Silica D, Silica E1, and Silica E2, respectively), while the other utilized enough to provide 2 wt.
  • the supernatant was collected and placed to the side and another 30 mL aliquot of deionized water was added to the centrifuge tube. The pellet was suspended and the process was repeated. This was done for a total of five more times to give a total wash of 180 mL after the initial dilution.
  • FIG. 2 illustrates the sustained release curves for Examples 12-17 (at 10 wt. % silica) if all 100 mg of silica were retained, and FIG. 3 illustrates the sustained release curves for Examples 18-23 (at 2 wt. % silica) if all 20 mg of silica were retained.
  • FIG. 2 demonstrates that at normal loading levels and if all 100 mg could be retained, Experimental Silica E1 and Silica E2 (Examples 16-17) showed the worst release profiles, except that of Silica A (Example 12). Silica A could not provide sustained release even at this unrealistic level of retained silica because it has an extremely low adsorptive capacity for CPC and cannot act as an effective reservoir. Therefore, all of the CPC is available and was washed away within the first washing. On the other hand, Silica E2 had the highest capacity for CPC, and because it is utilized at such a high loading level, it is essentially starved for the CPC agent and did not release it into the surrounding solution at a sufficient concentration. The best performers at this unrealistically high level of silica were actually the materials with middle levels of absorptive capacities, since there was enough mass to retain a sufficient quantity and a low enough absorptive capacity to allow for sufficient release.
  • FIG. 3 illustrates how the silica materials perform when the amount of silica retained is a more realistic quantity of 20 mg.
  • Silica A Example 18
  • the other comparative silica materials Examples 19-21; Silica B, Silica C, Silica D
  • the higher absorptive capacity materials Examples 22-23; Silica E1, Silica E2
  • levels of CPC greater than two to four times the MIC of 1 ppm were achieved for all six washes.
  • salivary flow rates of 0.5-1.0 mL/min, this would equate to the amount of saliva produced over three to six hours.
  • silica/silicate materials were evaluated for their potential to provide effective CPC release profiles.
  • Silica E3 was a very high CPC absorptive capacity silica
  • Silica E4 was also a relatively high CPC absorptive capacity silica (made via the processes described in U.S. Patent Nos. 8,945,517 and 8,609,068 , incorporated herein by reference in their entirety)
  • Silicate E5 was an aluminosilicate with a relatively high CPC absorptive capacity employed to investigate the ability of metal silicates to deliver similar performance to silicas.
  • each suspension was mixed for at least fifteen minutes prior to use, then a 1 g aliquot (typical toothpaste ribbon amount) was taken out while mixing and placed into a 45 mL centrifuge tube for the repetitive leaching study.
  • the remaining suspension was centrifuged at 5000 rpm for 15 minutes and the supernatant was collected and centrifuged again at 5000 rpm for 15 minutes to remove any remaining small particles.
  • the supernatant generated was collected to act as the point of initial use of the product.
  • the tube containing the 1 g aliquot was centrifuged at 5000 rpm for 15 minutes and the supernatant was discarded.
  • the pellets formed were then resuspended using 30 mL of pH 7.0 phosphate buffer and incubated on a rotating rack at 40 °C for 15 min, then centrifuged at 5000 rpm for 15 minutes and the supernatant was collected and centrifuged again at 5000 rpm for 15 minutes to remove any fines. The supernatant was collected and placed to the side and another 30 mL aliquot of pH 7.0 phosphate buffer was added to the centrifuge tube. The pellet was suspended and the process was repeated. This was done for a total of 18 more times to give a total wash of 570 mL after the initial dilution.
  • FIG. 4 illustrates the sustained release curves for Examples 24-27 (at 2 wt. % silica/silicate) if all 20 mg of silica/silicate were retained.
  • FIG. 4 illustrates how the silica/silicate materials perform when the amount of silica retained is a realistic quantity of 20 mg.
  • Silica E3 (Example 24), with the highest absorptive capacity, performed extremely well, in which levels of CPC of greater than or equal to two times the MIC of 1 ppm were achieved for all nineteen washes.
  • Silica E4 (Example 25) was able to sustain effective levels above the MIC for sixteen washes, but did not appear to be as effective as a release material as that of Silica E3.
  • Silicate E5 (Example 26), although not able to sustain the CPC levels as effectively as Silica E3 and Silica E4, indicated that silicate materials meeting the properties disclosed herein can provide release profiles similar to silicas. At normal salivary flow rates of 0.5-1.0 mL/min, Silica E3 and Silica E4 would sustain effective levels for about eight to sixteen hours.
  • silica and silicate materials possess some capacity for these quaternary ammonium agents, therefore the addition of another silica into the system would theoretically compete for the available agent and deplete the release silica.
  • silica based cleaning and polishing particles (“abrasive" silicas) that would be desirable in many oral formulations may reduce the efficacy of the release silica. Therefore, in addition to these initial studies, work was conducted to better understand the potential impact of additional silica/silicate materials in the formulation on this release profile.
  • a relative capacity for CPC on the release silica and different abrasive silicas was determined. This relative capacity was based on the respective CPC capacity and loading level of the silica.
  • the CPC capacity was established following the previously described titration method and the applicable usage level was set at 2 wt. % for the release silica and a specific level based on the relative cleaning ability of the abrasive silica.
  • Silica C would typically be utilized at 20 wt. %, but Silica A and Silica B often can provide equivalent cleaning at 10 wt. %, therefore these levels were utilized.
  • a desired amount of release silica (on a dry basis) was loaded into a 45 mL centrifuge tube, and the determined amount of 4 wt. % CPC solution was added. After adding the CPC solution, a pH 7.0 phosphate buffer solution made with ultrapure water was added to bring the total weight of the suspension up to 40 g.
  • This series utilized a weight of release silica to give 2 wt. % in the suspension (0.8 g on a dry basis) to mimic what could be theoretically retained in the mouth (Examples 28-31, using Silica E3, and Silica E3 with depleted CPC levels due to Silica A, Silica B, and Silica C, respectively).
  • a 2 wt. % suspension of Silica E3 was made using no CPC (Example 32), and this was analyzed identically to the CPC containing suspensions.
  • each suspension was mixed for at least fifteen minutes prior to use, then a 1 g aliquot (typical toothpaste ribbon amount) was taken out while mixing and placed into a 45 mL centrifuge tube for the repetitive leaching study. The remaining suspension was centrifuged at 5000 rpm for 15 minutes and the supernatant was collected and centrifuged again at 5000 rpm for 15 minutes to remove any fines. The supernatant generated was collected to act as the point of initial use of the product. The tubes containing the 1 g aliquot were centrifuged at 5000 rpm for 15 minutes and the supernatants were discarded.
  • a 1 g aliquot typically toothpaste ribbon amount
  • the pellets formed were then resuspended using 30 mL of pH 7.0 phosphate buffer and incubated on a rotating rack at 40 °C for 15 min, then centrifuged at 5000 rpm for 15 minutes and the supernatant was collected and centrifuged again at 5000 rpm for 15 minutes to remove any fines. The supernatants were collected and placed to the side and another 30 mL aliquot of pH 7.0 phosphate buffer was added to the centrifuge tubes. The pellets were suspended and the process was repeated. This was done for a total of 18 more times to give a total wash of 570 mL after the initial dilution.
  • FIG. 5 illustrates the sustained release curves for Examples 28-32 (at 2 wt. % silica/silicate) if all 20 mg of silica were retained.
  • FIG. 5 illustrates how the release silica materials perform when the amount of silica retained is a realistic quantity of 20 mg and when other silica materials can deplete the absorbed CPC.
  • the un-depleted release silica (Example 28) performed the best, in which levels of CPC of greater than or equal to two times the MIC of 1 ppm were achieved for all nineteen washes.
  • the release profile concentrations were lower and fell below the MIC more rapidly.
  • the higher CPC absorptive capacity of cleaning Silica C resulted in significant depletion of CPC from the release silica, thus dropping below the MIC after nine washes (Example 31).

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